Valve mechanism for pumps.



A, E. MOORHEAD.

VALVE MEOHANISMTOR PUMPS.'

APPLIoATIoN num nu 6,1909.

988,945. 'Patented Apr. 4, 1,911.

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ALBERT E. MOORHEAD, OF SAN FRANCISCO, CALIFORNIA.

VALVE MECHANISM FOR PUMPS.

Specification of Letters Patent.

Patented Apr. 4, 1911.

Application filed May 6, 1909. Serial N o. 494,275-

To all whom 'it may concern:

Be it known that I, ALBERT E. MooRHEAD, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in Valve Mechanismfor Pumps, of which the following is a specification.

The object of the present invention is to provide an improved valveespecially adapted for use in double ended pumping engines, such as formpart of neumatic cleaning apptratus used for o ce buildings, and the lie.

In the accompaying drawing, Figure 1 is broken side View of anapparatus, in which such valves are used; Fig. 2 is an enlargedlongitudinal section of the valve; Fig. 3 is a cross section of the sameon the line 3--3 of Fig. 2; F ig. 4 is a side View of the valvedetached.

Referring to the drawing, 1 indicates a tank or receiver upon which acylinderI 2 is supported by means of the casings 3 of conduits 4. Insaid cylinder reciprocate two pistons, not shown, which, by means ofcranks, rotate a shaft 5, whichV passes through a cylinder head 6. Theshaft 5 carries a worm 7 which meshes with a worm wheel 8. vThrough thehub 13 of said worm wheel passes loosely a shaft 9, to which areattached two collars 10, 10 formed with clutch faces 11, 11', adapted toengage clutch faces 12, 12, on the ends of the hub 13 of the worm wheel8. Consequently, when either of said clutches secured to the shaftengages one of the clutch faces 12, 12', the shaft is rotated with theworm wheel. The shaft 9 is adapted to be moved longitudinally by theforked lower end of a lever 14, pivoted upon an arm 15 secured upon avalve casing 16 on the right, said lower end engaging a groove 17 ofsaid collar 10 on the right. The shaft is also adapted to be rotated bymeans of a hand wheel 18 secured upon the collar 10 on the left. Eachend of the shaft is formed with a feather 21 which slides in a groove 22in a cylindrical recess 23 formed in a rotary valve 24, so that both ofsaid valves turn with said shaft. Each valve is formed with a head 25,which closes one end of the valve casing, and with a cylindrical portion26 which fits in the other end thereof, said head and cylindricalportion being spaced from each other opposite to a discharge port 27(Figs. 1 and 2). The cylindrical portion 26 of each valve is crossed bya diametral web 28 and is formed on opposite sides of said web with twoports 29, 30. Also, formed integral with the web at its outer end is ahalf head 31. Consequently the compartment on one side of said web, andone of said ports 29, are in communication with the outer end of thevalve, while the compartment on the other side of said web and the otherport 30 are in communication with the intermediate space between thecylindrical portion 26 of the valve and the head 25 thereof, andopposite to the port 27. Each valve rotates in a cylindrical shell 33,which has a port 34 on its inner side near one end opening to a passage35 leading to the corresponding end of the main cylinder 2, and on theopposite side is formed near the other end with a small opening 36opposite to the discharge port 27, and also opposite to the spacebetween the head 25 of the Valve and the cylindrical portion 26 thereof.The valve casing is closed at the outer end by a concave head 37 whichforms a passage connecting with the conduit 4 leading to the tank 1.

It will be seen that the port 30 can only be connected with exhaust,while the port 29 can only be connected with the tank. Also the gearingis such that the valve makes a complete turn with each completereciprocation of the piston in the main cylinder.

In the normal operation of the machine the shaft 9, which rotates thevalves, is so arranged that, when the piston at either end iswithdrawing from the corresponding end of the cylinder, and suction isbeing thereby created, the passage 35 and port 34 are connected with theport 30, and therefore with the tank, producing suction in the tank.lrVhen the piston begins its return movement, toward the same end of thecylinder, the port 30 is disconnected from the passage 35 and the port29 is connected thereto, so that the air which has been drawn into thecylinder is now forced out to exhaust. Suction takes place in the tankfrom opposite ends alternately, thus producing a substantially constantsuction of the tank. Should it be desired to compress the air in thetank instead of produce suction therein, the shaft 9 is moved part wayto the right, so as to release the clutch l0 on the right; the shaft 9is then given a half turn by means of the hand wheel 18, and themovement of the shaft to the right by the lever 14 is continued, therebycausing the clutch 10 on the left to engage the clutch on the wormwheel, so that the shaft 9 continues to be rotated in the same directionas before, but with the difference that, at the time when the port 30was formerly connected with the tank, the port 29 is now connectedtherewith, producing compression in the tank instead of suction therein.

I claim l. A rotary valve having at one end a completely closed head andat the other end a cylindrical portion having opposite ports, a webbetween the two ports separating said end into compartments, and anintermediate part connected with one end of said comf partments,substantially as described.

2. In combination with a cylindrical casing having in its cylindricalportion apertures near the respective ends, a rotary valve in saidcasing having' at one end a central web dividing said end intocompartments, and having` ports on opposite sides of said web, eitherofwhich can register with the aperture near the corresponding end of thecasing and also having an intermediate por-V tion, the whole of which isin communication with the aperture near the other end of the casing, andwhich is also in communication with one of said compartments, substan-vtially as described.

3. The combination of a rotary valve having a central web dividing thesame into .Y

compartments, conduits exclusively in communication with the respectivecompartments, a cylinder adapted to be connected with eithercompartment, a shaft, means for rotating the shaft with the movement ofthe piston in the cylinder, and means for independently rotating theshaft, substantially as described.

4L. The combination of a pair of valves each of which has a central webdividing the same into compartments, conduits exclusively incommunication with the respective compartments, a cylinder yadapted tokbe connected with either compartment, a shaft connected to both of saidvalves, means for rotating the shaft with the movement of the piston inthe cylinder, and means for independently rotating the shaft,substantially as described. Y

In testimony whereof I' have hereunto set my hand in the presence of twosubscribing witnesses.

ALBERT E. MOORHEAD.

litnesses:

FRANCIS M. WRIGHT, D. VB. RICHARDS.

Copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents, Washington, D. C.

